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From "Rahul Sharma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-16) Fix dependency versions
Date Thu, 19 Jul 2012 07:27:34 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-16?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418135#comment-13418135
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Rahul Sharma commented on CRUNCH-16:
------------------------------------

I can think of one more way of solving this. This dependency is being  used in  PTYPEs class.
We can refactor the piece that uses this code to a separate class.
There will be one more implementation of this piece without the dependency. Both these will
implementations will reside in separate src folders like src/main/CDH3/java and src/main/CHD4above/java.
The src folders will be enabled on the profile that gets built. Hadoop1 will have this code
and cdh3 version will not.

                
> Fix dependency versions
> -----------------------
>
>                 Key: CRUNCH-16
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-16
>             Project: Crunch
>          Issue Type: Task
>            Reporter: Matthias Friedrich
>            Priority: Critical
>              Labels: maven
>
> Right now, the compile time classpath doesn't exactly match the runtime classpath. For
example, Hadoop CDH3u4 comes with slf4j-api-1.4.3 while Crunch references slf4j-api-1.6.3.
This could result in NoSuchMethodError and other nasty problems.
> We have to make sure that version numbers match (check "mvn dependency:tree") and that
we don't ship artifacts that are already present on the runtime classpath. If our dependencies
introduce incompatible transitive dependencies, we might have to downgrade them.
> Note: Maven's dependency resolution is order-dependent, see http://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html

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